Tratakum Meditation

The use of Tratakum to increase concentration ability is well known. One of the traditional practices for this is to gaze at a candle. Here is how:
Sit in easy pose.
Position a candle about 7 feet away. The flame should be at the height of the root of the nose. Focus your eyes on the flame and see the corona of light around the flame. See the area just under the hottest tip of the flame where there is a dark spot; light and dark co-exist at this point.
Meditate at the Brow point with fixed concentration. This will stimulate the frontal lobes of the brain. When looking at the flame, simply see the radiance and meditate with as little blinking as possible.
To End: Inhale deeply, close the eyelids, and put the image of the radiant light at the Third Eye Point.